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  • Our global network ensures we are close wherever and whenever you need us.
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Your benefits

Versatile application
because the surface and corrosion protection allow our drives to be used in a wide range of extreme conditions.

Durable drives
because the preventive measures are tailored to your application and reliably protect your drives against external influences.

Durable drives with preventive measures up to OS4

Our gear units and motors can provide additional protection against typical corrosive agents in industrial environments, such as moisture, oils, dirt and chemicals, than what is provided as standard. Additional treatments and special materials allow these devices to be used even in extreme conditions. Use our drives in any atmosphere, from those with low moisture and contaminants to environments with regular wet cleaning using acidic and caustic agents.

Our surface protection levels range from standard to levels OS1* to OS3*. With the ASEPTICplus® package, OS4* is set as standard.


Find out more about the various surface protection options. Sample applications help you to select the right protection option for your gear unit or motor.
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NOTE: RAL 3020 Signal Red is the standard color for SEW gearmotors up to coating structure OS2. The exception is our ECO2 coating-free all-Aluminum gearmotors in certain configurations.

Additional Stocked Color Options:

  • RAL 9005 - Jet Black
  • RAL 5001 - Green / Blue
  • RAL 7031 - Blue / Gray
  • RAL 9007 - Gray Aluminum
  • RAL 9003 - Signal White

Custom RAL colors are available upon request.

Serial number replacements will default to the color initially supplied.

A Sustainable, Cost-Effective Advantage

Coating-free aluminum gearmotors in the ECO2 design

Efficient and reliable

  • In indoor spaces with a maximum humidity of 60%
  • At temperatures of -20 °C up to a maximum of +60 °C
  • The ECO2 design meets the requirements of ISO 12944 corrosivity category C1.

Models and sizes on the "Which gear units are coating-free?" tab are coating-free by default, delivering efficiency and sustainability.

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Gear units, gearmotors, and standard AC motors in these sizes and configurations automatically default to be coating-free unless otherwise specified. Please contact Customer Service for additional details.
R.. Gear Units F..
Gear Units 		K..
Gear Units 		W..0
Gear Units 		W..9
Gear Units 		DR.. Motors
R07 F27 K19 W10 W19 56
R17   K29 W20 W29 63
R27     W30 W39 71
        W49 80
        W59 90

Instead of standard surface protection, motors and gear units are optionally available with OS1, OS2, OS3 or OS4 surface protection. This equips the gearmotors for use in different ambient conditions.

You can also choose additional special measure “Z.” This means that large contour recesses are filled with rubber before painting.
Surface protection   Ambient conditions/sample applications
Standard standard For machines and systems within buildings and interior rooms with neutral atmospheres.
  • C1 (negligible)*
Sample applications:
  • Machines and systems in the automotive industry
  • Conveyor systems in logistics areas
  • Conveyor belts at airports
OS1 OS1 For environments prone to condensation and atmospheres with low humidity or contamination. E.g. outdoor applications under a roof or other protection device.
  • C2 (low)*
Sample applications:
  • Systems in saw mills
  • Hall gates
  • Agitators and mixers
OS2 OS2 For environments with high humidity or moderate atmospheric contamination. E.g. applications outdoors subject to direct weathering.
  • C3 (moderate)*
Sample applications:
  • Applications in amusement parks
  • Aerial tramways and chair-lifts
  • Applications in gravel plants
  • Systems in nuclear power plants

OS3 OS3 For environments with high humidity and occasionally severe atmospheric and chemical contamination. Occasional acidic or caustic wet cleaning. Also for applications in coastal areas with moderate salt load.
  • C4 (high)*
Sample applications:
  • Sewage treatment plants
  • Port cranes
  • Mining applications
OS4 OS4 For environments with permanent humidity and severe atmospheric or chemical contamination. Regular acidic and caustic wet cleaning, also with chemical cleaning agents.
  • C5-I / C5-M (severe)*
Sample applications:
  • Drives in malting plants
  • Wet areas in the beverage industry
  • Conveyor belts in the food industry

Aseptic motors of the DAS.. series
OS2-OS4 as needed 		OS2-OS4 Suitable for dry or wet hygienic areas with average atmospheric contamination. Also suitable for particularly dusty environments.
  • C3 (moderate)*
Sample applications:
  • Applications in clean rooms
  • Machines in the cosmetic and pharmaceutical industry
  • Systems for processing grains and flour (without explosion protection)
  • Conveyor belts in cement plants

Aseptic motors of the DAS.. series with ASEPTICplus® drive package OS4 with ASEPTICplus® For hygienic areas in the food and beverage industry with permanent humidity, regular acidic or caustic wet cleaning with chemical agents and pressure cleaning.
  • C5-I (severe)*
Sample applications:
  • Hygienic and aseptic conveyors in the beverage industry
  • Systems in cheese dairies and meat processing plants
  • “Splash zones” in the food industry
Aseptic motors of the DAS.. series with XCO® drive package XCO drive package For hygienic areas in the food and beverage industry with permanent humidity, regular acidic and caustic wet cleaning using chemical cleaning agents, and cleaning with pressure load.

XCO®: The new tin-nickel surface protection:
  • No coating can come off
  • Appearance like stainless steel
  • C5-I (severe)*
Sample applications:
  • Hygienic and aseptic conveyors in the beverage industry
  • Systems in cheese dairies and butcher shops
  • „Splash zones“ in the food industry
High-protection coating
HP200 		HP200 Suitable for hygienic areas in the food and beverage industry with regular acidic or caustic wet cleaning. Anti-stick properties support the cleaning process even in inaccessible areas.
Sample applications:
  • Hygienic and aseptic conveyors in the beverage industry
  • Systems in cheese dairies and meat processing plants
  • “Splash zones” in the food industry
Stainless steel gearmotor Stainless steel Suitable for hygienic areas in the food and beverage industry with permanent humidity and regular acidic and wet cleaning with chemical cleaning agents.
Sample applications:
  • Hygienic and aseptic applications of all types
  • Systems in cheese dairies and meat processing plants
  • Food processing machines for the North American market
  • All retaining screws that must be loosened during operation are made of stainless steel.
  • The nameplates are made of stainless steel. Various motor parts are coated with a finishing varnish.
  • Flange contact surfaces and shaft ends are treated with a temporary rust preventive.
  • Clamping straps as additional measures for brakemotors